Styles define how features look on a map. Styles can be defined for the map as a whole, for specific events like when a feature is selected, or for individual features. Example style array:
array( 'pointRadius' => 5, 'fillColor' => '#FFCC66', 'strokeColor' => '#FF9933', 'strokeWidth' => 2, 'fillOpacity' => 0.5 );See the following OpenLayers docs as well: